Stool



FIG. 1 is a top, side perspective view of a stool showing my design therefor;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear being the same;

FIG. 4 is a right side elevational view thereof, the left being the same;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a stool, as shown and described. 